INVENTORIES - COSTS (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Inventory [Line Items]
Costs and estimated earnings in excess of billings on uncompleted contracts	$ 106.0	$ 87.7
Excess over average costs on long-term contracts	517.3	438.1
Work-in-process inventories
Inventory [Line Items]
Costs and estimated earnings in excess of billings on uncompleted contracts	106.0	87.7
Excess over average costs on long-term contracts	$ 517.3	$ 438.1